JPH02303242A - Bus repeater - Google Patents

Bus repeater

Info

Publication number
JPH02303242A
JPH02303242A JP1125014A JP12501489A JPH02303242A JP H02303242 A JPH02303242 A JP H02303242A JP 1125014 A JP1125014 A JP 1125014A JP 12501489 A JP12501489 A JP 12501489A JP H02303242 A JPH02303242 A JP H02303242A
Authority
JP
Japan
Prior art keywords
bus
signal
polling
data communication
cable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1125014A
Other languages
Japanese (ja)
Inventor
Takuma Fukuda
福田　琢磨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP1125014A priority Critical patent/JPH02303242A/en
Priority to US07/523,730 priority patent/US5107257A/en
Publication of JPH02303242A publication Critical patent/JPH02303242A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4004—Coupling between buses
    • G06F13/4027—Coupling between buses using bus bridges
    • G06F13/4045—Coupling between buses using bus bridges where the bus bridge performs an extender function

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To attain data communication without the use of loop state bus structure by using a polling signal and applying the bus direction control of a repeater. CONSTITUTION:A bus repeater (BC) 1 is relayed with transmission lines I, II. The repeater BC 1 is provided with a termination resistor 11 for the transmission lines I, II, a cable receiver 13a, a cable driver 12a for transmitting a data from the transmission I to the transmission line II, a cable receiver 13b and a cable driver 12b transferring a data from the transmission II to the transmission line I. Moreover, a direction switching control section (SWC) 15 is provided, which generates a switching signal 16 to designate the relay data transfer direction between the transmission lines I and II. The SWC 15 uses a polling initializing signal 18 to initialize the internal circuit and uses a polling signal 17 to generate the switching signal 16 based on the counted number and the data transfer direction is designated by making an enable signal for the cable drivers 12a, 12b active or nonactive.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はバス中継装置に関し、特にマルチデータ通信処
理システムにおいてデータ通信処理装置を数個のグルー
プに分けてグループごとにボーリング動作を行って中継
装置間の通信を行うバス中継装置に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a bus relay device, and in particular, in a multi-data communication processing system, data communication processing devices are divided into several groups, and a boring operation is performed for each group for relaying. The present invention relates to a bus relay device that performs communication between devices.

〔従来の技術〕[Conventional technology]

従来、この種の中継装置は、入力側ボートと出力側ボー
トを有し、入力側ボートから受信したアドレスを出力側
ボートへ中継するものであり、バスの方向は信号線によ
って定まっており、ポーリング信号には無関係であった
。Conventionally, this type of relay device has an input side boat and an output side boat, and relays the address received from the input side boat to the output side boat.The direction of the bus is determined by a signal line, and polling It had nothing to do with the signal.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の中継装置では、信号線の方向制御はポー
リング信号とは無関係であるため、バスをループ構成し
なければならないという欠点がある。The conventional relay device described above has the disadvantage that the bus must be configured in a loop because the direction control of the signal line is unrelated to the polling signal.

〔課題を解決するための手段〕[Means to solve the problem]

本発明のバス中継装置は、複数のデータ通信処理装置を
グループ化し他のグループに属するデータ通信処理装置
と中継装置を介して接続してなるマルチデータ通信処理
システムにおいて、前記中継装置は第１のグループに存
在するバス制御装置から発信されるポーリング信号をカ
ウントする計敵手段と、この計数手段のカウント数によ
りバス方向を切り譬える切替手段とを備えることを特徴
とする。A bus relay device of the present invention is a multi-data communication processing system in which a plurality of data communication processing devices are grouped and connected to data communication processing devices belonging to other groups via a relay device, wherein the relay device is a first bus relay device. The present invention is characterized by comprising a counting means for counting polling signals transmitted from bus control devices existing in the group, and a switching means for switching the bus direction based on the count of the counting means.

〔実施例〕〔Example〕

次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明のバス中継装置の一実施例を示す回路ブ
ロック図、第２図は第１図における方向′切替制御部の
一例の回路図、第３図は第２図における方向切替動作を
示すタイミング図、第４図は第１図におけるバス中継装
置の一使用例を示すマルチデータ通信処理システムのブ
ロック図、第５図は第４図におけるバス中継装置のアド
レスを示す図、第６図は第４図におけるデータ通信動作
を説明するための図である。FIG. 1 is a circuit block diagram showing an embodiment of the bus relay device of the present invention, FIG. 2 is a circuit diagram of an example of the direction switching control section in FIG. 1, and FIG. 3 is the direction switching operation in FIG. 2. FIG. 4 is a block diagram of a multi-data communication processing system showing an example of the use of the bus relay device in FIG. 1, FIG. 5 is a diagram showing addresses of the bus relay device in FIG. 4, and FIG. This figure is a diagram for explaining the data communication operation in FIG. 4.

第１図において、伝送路■と伝送路■はバス中継装置（
以下ＢＣ）１によって中継される。ＢＣｌは伝送路Ｉと
伝送路■の終端抵抗１１と、伝送路Ｉから伝送路■ヘデ
ータ転送するためのケーブルレシーバ１３ａおよびケー
ブルドライバ１２ａと伝送路■から伝送路Ｉヘデータ転
送するためのケーブルレシーバ１３ｂおよびケーブルド
ライバ１２ｂと、伝送路Ｉと伝送路Ｈの中継のデータ転
送方向を指定する切替信号１６を生成するための方向切
替制御部（以下５ＷＣ）１５とを備えている。ＳＷＣ１
５はポーリングイニシャライズ信号１８によって内部回
路が初期化され、ポーリング信号１７によってカウント
したカウント数によって切替信号１６を発生し、ケーブ
ルドライバ１２ａと１２ｂのイネーブル信号をアクティ
ブ又はインアクティブにすることによってデータ転送方
向を指定する。In Figure 1, transmission line ■ and transmission line ■ are bus relay devices (
(hereinafter referred to as BC)1. BCl includes a terminating resistor 11 for transmission line I and transmission line ■, a cable receiver 13a and a cable driver 12a for transferring data from transmission line I to transmission line ■, and a cable receiver 13b for transferring data from transmission line ■ to transmission line I. and a cable driver 12b, and a direction switching control unit (hereinafter referred to as 5WC) 15 for generating a switching signal 16 specifying the data transfer direction of the relay between the transmission line I and the transmission line H. SWC1
5, an internal circuit is initialized by a polling initialization signal 18, a switching signal 16 is generated according to the count counted by a polling signal 17, and the data transfer direction is changed by making the enable signals of the cable drivers 12a and 12b active or inactive. Specify.

次に、第４図に示すマルチデータ通信処理システムは、
第１グループのデータ通信処理装置（以下ＣＰ）２１１
〜２１ｎ、第２グループのＣＰ２２１〜２２ｎ、第３グ
ループのＣＰ２３１〜２３ｎの３つにグループ化され、
隣接グループ間にＢＣＩＢ、ＩＣが位置し、ＢＣＩＡと
ＢＣＩＢ間にあるバス制御装置（以下ＢＳＣ）２０から
ポーリング信号を発信する。Next, the multi-data communication processing system shown in FIG.
First group data communication processing device (hereinafter referred to as CP) 211
~21n, a second group of CP221~22n, and a third group of CP231~23n,
BCIB and IC are located between adjacent groups, and a polling signal is transmitted from a bus control device (hereinafter referred to as BSC) 20 located between BCIA and BCIB.

第１図における５ＷＣ１５は、第２図に示すようにシフ
タ（以下５ＦＴ）１５０と、切替信号生成のための選択
ゲート１５１，１５２．１５３と、方向切替ゲート１５
４によって構成される。As shown in FIG. 2, 5WC15 in FIG.
Consisting of 4.

ポーリング動作はグループごとに実施され１つ目のポー
リングでは第１グル−プ、２つ目のポーリングでは第２
グル−１，３つ目のポーリングでは第３グループのポー
リングが行なわれる。Polling operations are carried out for each group, with the first polling for the first group and the second polling for the second group.
In group 1 and third polling, polling of the third group is performed.

次に第２図〜第６図を用いてバス中継装置の方向切替制
御動作について説明する。Next, the direction switching control operation of the bus relay device will be explained using FIGS. 2 to 6.

まず最初に第３図のタイミングチャートのポーリングイ
ニシャライズ信号１８によって５ＦＴ１５０が初期リセ
ットされる。次にポーリング信号１７が入力すると５Ｆ
Ｔ１５０の出力ＱＡ＋さらにポーリング信号１７が入力
するとＱａ。First, the 5FT 150 is initially reset by the polling initialization signal 18 shown in the timing chart of FIG. Next, when polling signal 17 is input, 5F
When the polling signal 17 is input to the output QA of T150+Qa.

Ｑｏの出力が発生する。第２図におけるアドレスＡ（１
、Ａｌ　、Ａ２は方向切替選択ゲート１５１゜１５２．
１５３で、例えば第５図に示すようにあらかじめ設定し
ておく、第５図において、１のときは方向切替えが有効
である。第４図に示すＢＣＩＢは５ＦＴ１５０の出力Ｑ
ａが１のとき、つまりポーリング信号１７が２つ目のと
き方向が切り替わる。このときの方向切替えの状態を第
６図（ｂ）に示している。同様に第２図に示すＢＣＩＣ
は５ＦＴ１５０の出力Ｑｃが１のとき、つまりポーリン
グ信号１７が３つ目のとき方向が切り替わる。このとき
の方向切替えの状態を第６図（Ｃ）に示している。グル
ープごとのポーリングを受けたＣＰでバスアクセス要求
が発生すると、バスの使用権を獲得した後、着信先アド
レスを送出する。ＢＣは着信アドレスがすべてのＣＰで
受信できるように方向制御を行なう、−回目のポーリン
グ信号では発信元のＣＰが第１グループに存在するので
、方向制御は第６図（ａ）の矢印のように向いている。An output of Qo is generated. Address A (1
, Al, A2 are direction switching selection gates 151°152.
At step 153, for example, it is preset as shown in FIG. 5. In FIG. 5, when it is 1, direction switching is effective. BCIB shown in Figure 4 is the output Q of 5FT150.
When a is 1, that is, when the polling signal 17 is the second, the direction is switched. The state of direction switching at this time is shown in FIG. 6(b). Similarly, the BCIC shown in Figure 2
The direction is switched when the output Qc of the 5FT 150 is 1, that is, when the polling signal 17 is the third one. The state of direction switching at this time is shown in FIG. 6(C). When a bus access request occurs in a CP that has been polled for each group, it acquires the right to use the bus and then sends out the destination address. The BC performs direction control so that the incoming address can be received by all CPs.In the -th polling signal, the source CP is in the first group, so the direction control is performed as shown by the arrow in Figure 6(a). suitable for

二回目のポーリングでは発信元のＣＰが第２グループに
存在するので、方向制御は第６図（ｂ）の矢印のように
向き、三回目のポーリングでは発信元のＣＰが第３グル
ープに存在するので、第６図（Ｃ）の矢印のように方向
制御される。このＢＣの方向制御により、第６図に示す
ような発信元と着信先の間でのデータ通信動作が行なわ
れる。ポーリングの数により、中継装置のバス方向はＢ
ＣＩＢ→ＩＣ→ＩＤ→ＩＢの順で切り替えられる。In the second polling, the source CP is in the second group, so the direction control is directed as shown by the arrow in Figure 6(b), and in the third polling, the source CP is in the third group. Therefore, the direction is controlled as shown by the arrow in FIG. 6(C). By controlling the direction of the BC, a data communication operation is performed between the originator and the destination as shown in FIG. Depending on the number of polls, the bus direction of the relay device is B.
It can be switched in the order of CIB → IC → ID → IB.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、ポーリング信号を使用し
て中継装置のバス方向制御をすることにより、ループ状
のバス構成をとらないでデータ通信を行うことができる
効果がある。As described above, the present invention has the advantage that by controlling the bus direction of a relay device using a polling signal, data communication can be performed without using a loop bus configuration.

図面の簡単な説明 第１図は本発明のバス中継装置の一実施例を示す回路ブ
ロック図、第２図は第１図における方向切替制御部の一
例の回路図、第３図は第２図における方向切替動作を示
すタイミング図、第４図は第１図におけるバス中継装置
の一使用例を示すマルチデータ通信処理システムのブロ
ック図、第５図は第４図におけるバス中継装置のアドレ
スを示す図、第６図は第４図におけるデータ通信動作を
説明するための図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit block diagram showing one embodiment of the bus relay device of the present invention, FIG. 2 is a circuit diagram of an example of the direction switching control section in FIG. 1, and FIG. FIG. 4 is a block diagram of a multi-data communication processing system showing an example of the use of the bus relay device in FIG. 1, and FIG. 5 shows the address of the bus relay device in FIG. 4. 6 are diagrams for explaining the data communication operation in FIG. 4.

１、　　ＩＡ、　　ＩＢ、ＩＣ・・・バス中継装置（Ｂ
Ｃ）、１１・・・終端抵抗、１２ａ、１２ｂ・・・ケー
ブルドライバ、１３ａ、１３ｂ・・・ケーブルレシーバ
、１４・・・インバータ、１５・・・方向切替制御部（
ＳＷＣ）、１６・・・切替信号、１７・・・ポーリング
信号、１８・・・ポーリングイニシャライズ信号、２０
・・・バス制御装置（ＢＳＣ）、２１１．〜２１ｎ、２
２１．〜２２ｎ、２３’ｌ、〜２３ｎ・・・データ通信
処理装置（ＣＰ）、１５０・・・シフタ（ＳＦＴ）、１
５１゜〜１５３・・・選択ゲート、１５４・・・方向切
替ゲート。1. IA, IB, IC...Bus relay device (B
C), 11... Terminal resistor, 12a, 12b... Cable driver, 13a, 13b... Cable receiver, 14... Inverter, 15... Direction switching control unit (
SWC), 16... Switching signal, 17... Polling signal, 18... Polling initialization signal, 20
...Bus control device (BSC), 211. ~21n, 2
21. ~22n, 23'l, ~23n...Data communication processing device (CP), 150...Shifter (SFT), 1
51° to 153... Selection gate, 154... Direction switching gate.

Claims (1)

【特許請求の範囲】[Claims] 複数のデータ通信処理装置をグループ化し他のグループ
に属するデータ通信処理装置と中継装置を介して接続し
てなるマルチデータ通信処理システムにおいて、前記中
継装置は第１のグループに存在するバス制御装置から発
信されるポーリング信号をカウントする計数手段と、こ
の計数手段のカウント数によりバス方向を切り替える切
替手段とを備えることを特徴とするバス中継装置。In a multi-data communication processing system in which a plurality of data communication processing devices are grouped and connected to data communication processing devices belonging to other groups via a relay device, the relay device connects a bus control device existing in a first group to a data communication processing device belonging to another group. A bus relay device comprising: a counting means for counting polling signals to be transmitted; and a switching means for switching the bus direction according to the count number of the counting means.
JP1125014A 1989-05-17 1989-05-17 Bus repeater Pending JPH02303242A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1125014A JPH02303242A (en) 1989-05-17 1989-05-17 Bus repeater
US07/523,730 US5107257A (en) 1989-05-17 1990-05-15 Bus relay apparatus for multi-data communication processing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1125014A JPH02303242A (en) 1989-05-17 1989-05-17 Bus repeater

Publications (1)

Publication Number Publication Date
JPH02303242A true JPH02303242A (en) 1990-12-17

Family

ID=14899727

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1125014A Pending JPH02303242A (en) 1989-05-17 1989-05-17 Bus repeater

Country Status (2)

Country Link
US (1) US5107257A (en)
JP (1) JPH02303242A (en)

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US5493657A (en) * 1993-06-21 1996-02-20 Apple Computer, Inc. High speed dominant mode bus for differential signals
US5365512A (en) * 1993-07-02 1994-11-15 Ericsson Ge Mobile Communications Inc. Multisite trunked RF communication system with reliable control messaging network
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US6288592B1 (en) * 1998-01-21 2001-09-11 Gennum Corporation Cable driver with controlled linear rise and fall
US7194561B2 (en) * 2001-10-12 2007-03-20 Sonics, Inc. Method and apparatus for scheduling requests to a resource using a configurable threshold
US6804738B2 (en) * 2001-10-12 2004-10-12 Sonics, Inc. Method and apparatus for scheduling a resource to meet quality-of-service restrictions
US6724224B1 (en) 2003-04-07 2004-04-20 Pericom Semiconductor Corp. Bus relay and voltage shifter without direction control input
US8504992B2 (en) * 2003-10-31 2013-08-06 Sonics, Inc. Method and apparatus for establishing a quality of service model
US7665069B2 (en) * 2003-10-31 2010-02-16 Sonics, Inc. Method and apparatus for establishing a quality of service model
US9087036B1 (en) 2004-08-12 2015-07-21 Sonics, Inc. Methods and apparatuses for time annotated transaction level modeling
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Also Published As

Publication number Publication date
US5107257A (en) 1992-04-21

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